The House
Cultivated stones, loose by the carat.
HOWDEN is a house for loose diamonds. We do not make jewelry. We do not run a factory. We source certified lab-grown stones, one at a time, and offer them as they were graded — by the carat, with the report attached.
Each diamond is grown in a controlled environment using the same elemental process that occurs beneath the earth, only faster and with greater precision. The result is chemically and optically identical to a mined stone, and entirely traceable.
Every rough is planned, cut and polished by trained hands, then graded independently by IGI or GIA. We list only stones we would choose to set ourselves; everything else stays in the rough.
The standard
Four measures. One stone.
Cultivation
Grown atom by atom over weeks in a controlled reactor — chemically and optically identical to a mined stone.
Cut
Rough is planned and polished by master cutters; we list only stones that read with life and precision.
Grading
Every stone is independently graded by IGI or GIA, with the report shipped alongside the diamond.
Traceability
Each diamond carries a documented origin, from reactor to certificate to your hand.
A standard, not a style.
We list diamonds by a single measure: would we set this stone ourselves? If the answer is anything other than yes, it does not enter the vault.
View the diamonds